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Old 11-18-2020, 01:24 PM
mgriffin mgriffin is offline
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Default Roll or Taper Crimp?

Years ago I was reloading .38Spl. I was still working and really didn't have a good/dedicated area for the hobby and ended up selling my setup to a guy a work. I'm now retired and thinking about starting up again. I know it's a bad time (finding primers and bullets) but still thinking about it. I was using a RCBS Rockchucker with their carbide dies but can't remember if I was using a roll or taper crimp. I have found the RCBS carbide dies on line and they use a roll crimp. Is roll crimp what I want for .38 Spl and .357 Mag? Thanks!
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Old 11-18-2020, 01:43 PM
OKFC05 OKFC05 is offline
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The usual crimp die furnished with a .38/.357 die set is a roll crimp. You can buy taper crimp dies also. I use only roll crimp dies in this caliber but vary the crimp for HBWC (minimum crimp) vs .357 158gr SP (crimp almost to bottom of groove), for example.
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Old 11-18-2020, 01:45 PM
cfplinker cfplinker is offline
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If your bullets have a crimp groove use a roll crimp.

If these are wadcutters that will be used with a S&W model 52 then you may need to use a taper crimp ahead of the crimp groove in order to get them to feed through the magazine.
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Old 11-18-2020, 01:48 PM
rockquarry rockquarry is online now
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Ideally, it would be best to try both and shoot some benchrested 25 yard groups. I've seen slightly better overall accuracy with taper crimp in .38 Special, but I'm not sure the difference would be enough reason to buy another crimp die if you don't already have one. I can't recall using anything but roll crimp in .357, but a taper crimp might be fine.
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Old 11-18-2020, 01:51 PM
diyj98 diyj98 is offline
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I like a taper crimp for automatic pistols, but a roll crimp for revolvers. Especially magnum loads.
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Old 11-18-2020, 05:33 PM
robertrwalsh robertrwalsh is online now
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Generally speaking it is like DIYJ98 says.
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Old 11-18-2020, 05:46 PM
Moe Mentum Moe Mentum is offline
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Roll for 38/357
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Old 11-18-2020, 07:07 PM
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Nevada Ed Nevada Ed is offline
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The 38 special and 357 Magnum dies came out with a roll crimp as standard equipment, that would work with the lead bullets and also the copper jacket bullets that had a good cannelure on them.

With todays plated bullets the "Can" is minimal or not even on the bullet........
so a taper crimp is best for this style of bullet.

You can set a roll crimp to where it just takes out the belling of the case for
auto pistols or plated bullets.
You only need to crimp medium to heavy loads in your revolvers, if there is a chance of bullet "Pull".
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Old 11-18-2020, 10:51 PM
38SPL HV 38SPL HV is offline
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Suggest a roll crimp die and crimp in the crimp groove. I use both a Redding Profile Crimp Die or Lee Factory Crimp Die.
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Old 11-19-2020, 11:39 AM
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My rule of thumb; "Roll crimp for revolvers, and Taper crimp for Semi-auto's". The 38's I loaded for my 52-2 were Taper crimped. All 9mm, .380, .45acp, 10mm, etc are Taper crimped.
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Old 11-19-2020, 12:02 PM
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I shoot blue bullets in 38 which are round nose smooth and no cannelure. Therefor they get a taper crimp applied with a 9mm die, just enough to bring in the case mouth, nice and easy does it.
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Old 11-19-2020, 12:07 PM
Borderboss Borderboss is offline
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I roll crimp, even if the bullet doesn't have a cannelure like some of the plated bullets I have. The die can still do it since the bullet is basically soft lead.
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Old 11-19-2020, 12:07 PM
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Quote:
Originally Posted by H Richard View Post
My rule of thumb; "Roll crimp for revolvers, and Taper crimp for Semi-auto's". The 38's I loaded for my 52-2 were Taper crimped. All 9mm, .380, .45acp, 10mm, etc are Taper crimped.
The reason for boh type crimps! A roll crimp is to prevent "bullet pull" on a revolver that would have a med to large recoil. Simple physics; for every action there is an equal, and opposite, reaction(bullet moves forward with a given force, the gun moves backwards with the same amount of force)!
In an auto a taper crimp is used because in most autos the round is headspaced on the case length! Bullet pull is not a factor because the next round is in the mag and can not move out of the case. All that being stated, I roll crimp all my 9mm, 38Super, 40S&W, 45 ACP, 10mm! They are all shot out of revolvers! !
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Old 11-19-2020, 02:12 PM
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mikld mikld is offline
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Unless for special applications, roll, profile or collet crimp for revolver handloads. Taper "crimp", aka "deflaring" die for semi-auto handloads. Many still shoot/reload for S&W Model 52 pistols and need a taper crimp. Plated bullets are recommended to use taper crimp (I will not/do not use plated for any revolver use, semi-auto handloads on rare occasions and only for experimenting or if I have no jacketed or run out of lead alloy).

And just like almost every other method of reloading, there are "exceptions" and personal preferences. I have loaded a lot of 38 Special wadcutters both HBWC and DEWC and lightly roll crimped, but many prefer a taper crimp. Worked quite well for me but I did not compete in Bullseye Shooting and my handloads were more accurate than I could shoot...
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